NL2034852A

NL2034852A - High-efficiency welded h-shaped steel and application technology thereof

Info

Publication number: NL2034852A
Application number: NL2034852A
Authority: NL
Inventors: Sui Qinghai
Original assignee: China Northeast Architectural Design & Res Institute Co Ltd
Priority date: 2022-05-19
Filing date: 2023-05-17
Publication date: 2023-11-27
Also published as: NL2034852B1; CN114960941A

Abstract

The present disclosure provides a high-eﬂiciency welded H-shaped steel and an application technology thereof, including a H-shaped steel, and the H-shaped steel includes a ﬂange, which is set as a high-grade steel and includes an upper ﬂange and a lower ﬂange, and the upper ﬂange and the lower ﬂange are arranged in parallel with unequal thickness, and a web, which is set as a low-grade steel, the web is vertically arranged between the upper ﬂange and the lower ﬂange, and two ends of the web are in welding connection with the upper ﬂange and the lower ﬂange, respectively.

Description

HIGH-EFFICIENCY WELDED H-SHAPED STEEL AND APPLICATION

TECHNOLOGY THEREOF

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of building engineering, in particular to a high-efficiency welded H-shaped steel and an application technology thereof.

BACKGROUND

[0002] At present, in a floor structure building, a steel structure building conforms to the development concept of green building and has a wide application prospect, and more and more steel is produced in our country, thereby providing sufficient support for the development of the steel structure. In the steel structure building, a steel amount of a steel beam accounts for about 60% of a total steel amount, and the bigger the span, the higher the proportion may be. In the steel amount of the steel beam, the steel amount of a web accounts for 40-45%, and a thickness of the web is basically controlled by a height-thickness ratio of a plate. However, in an actual steel structure, a shear carrying capacity of the steel beam does not play a control role generally, for a large-span structure, a beam height is often more than 1 m, the web must be thicker due to a limitation of the height-thickness ratio, and the steel strength can be not developed, which is really a waste.

[0003] In the prior art, the height-thickness ratio of the steel plate is related to a yield strength of the steel, the higher the yield strength, the smaller the limiting value of the height-thickness ratio will be, which is not conductive to developing the steel strength fully. On the one hand, the H-shaped steel requires a higher steel strength, and on the other hand, the strength of the high-strength steel cannot be developed fully, and therefore a high-efficiency welded H-shaped steel and an application technology thereof are proposed.

SUMMARY

[0004] The prevent disclosure aims at providing a high-efficiency welded H-shaped steel and an application technology thereof, so as to solve the problem that, on the one hand, the H-shaped steel requires a higher steel strength, and on the other hand, the strength of the high-strength steel cannot be developed fully.

[0005] In order to implement the above purpose, the present disclosure provides the following technical solution: a high-efficiency welded H-shaped steel and an application technology thereof, including a H-shaped steel, and the H-shaped steel includes:

[0006] a flange, which is set as a high-grade steel and includes an upper flange and a lower flange, and the upper flange and the lower flange are arranged in parallel with unequal thickness;

[0007] a web, which is set as a low-grade steel, the web is vertically arranged between the upper flange and the lower flange, and two ends of the web are in welding connection with the upper flange and the lower flange, respectively.

[0008] Preferably, an outboard length of the flange is subjected to a limiting value of a width-thickness ratio of a plate as S3, and the limiting value of the width-thickness ratio of the upper flange is thinned to S4.

[0009] Preferably, the H-shaped steel is connected to a concrete floor through studs.

[0010] Preferably, the width-thickness ratio of the upper flange is regulated through a distance between studs and an edge distance from the studs to the upper flange.

[0011] Preferably, for a high-rise steel structure, further including a frame column of the high-grade steel, and a node between the H-shaped steel and the frame column is provided with a connecting plate or a bracket.

[0012] Preferably, a steel grade of the connecting plate is set to be same with that of the flange.

[0013] Preferably, a steel grade of the bracket is set to be same with that of the flange.

[0014] Preferably, when a maximum stress of the web is greater than or equal to the steel grade of the web, the web yields and enters a plastic zone, and a bending bearing capacity of the H-shaped steel cuts out the plastic zone.

[0015] Preferably, upon calculation of to a triangle similarity principle, a computational formula for the plastic zone is X=(c-fy)h/2c:

[0016] The computational formula for the bending bearing capacity: M = vo*w-0.5*%(o-ty)* X*(h-2tw-2X/3)*tf,

[0017] y is a plastic development coefficient of a section, fy is a yield strength of the web, and the web may adopt Q235 steel, and X in the computational formula for the plastic zone is brought into the computational formula for the bending bearing capacity,

to obtain the bending bearing capacity M.

[0018] Compared with the prior art, the present disclosure has the following beneficial effects: a high-efficiency welded H-shaped steel and an application technology thereof implement that, on the one hand, the H-shaped steel has the higher steel strength, and on the other hand, the strength of the high-strength steel may be fully developed in a manner that the high-grade steel flange and the low-grade steel flange are provided, the upper flange and the lower flange are arranged in parallel with unequal thickness, and the steel grade of the connecting plate or the bracket is set to the steel that is the same as the steel grade of the flange.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a structure schematic diagram of the present disclosure.

[0020] In the drawing: 1-H-shaped steel, 2-flange, 21-upper flange, 22-lower flange, 3-web.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solutions in the embodiments of the present disclosure are clearly and completely elaborated below in combination with the drawings. It is apparent that the described embodiments are only a part of the embodiments of the present disclosure but not all. Based on the embodiments of the present disclosure, all the other embodiments obtained by those of ordinary skill in the art on the premise of not contributing creative effort should belong to the protection scope of the present disclosure.

[0022] Embodiment 1:

[0023] Please refer to FIG. 1, the present disclosure provides a technical solution: a high-efficiency welded H-shaped steel 1 and an application technology thereof, including a H-shaped steel 1, and the H-shaped steel 1 includes a flange 2, which is set as a high-grade steel (Q355 or Q390) and includes an upper flange 21 and a lower flange 22, and the upper flange 21 and the lower flange 22 are arranged in parallel with unequal thickness; and a web 3, which is set as a low-grade steel (Q235), the web 3 is vertically arranged between the upper flange 21 and the lower flange 22, and two ends of the web 3 are in welding connection with the upper flange 21 and the lower flange 22, respectively. The steel (Q355 or Q390) with the high-strength grade is used as the flange 2, and the steel (Q235) with the low-strength grade is used as the web 3, and the flange 2 and the web 3 are combined and welded to the H-shaped steel 1; when the

H-shaped steel 1 is used as a steel beam, a height-thickness ratio of the web 3 is controlled according to the low-strength grade steel, the flange 2 is controlled according to the high-strength grade steel, thereby playing the requirements that the

H-shaped steel 1 has a high loading capacity on the flange 2 and low loading capacity on the web 3, and implementing that, on the one hand, the H-shaped steel 1 has a higher steel strength, and on the other hand, the strength of the high-strength steel may be fully developed.

[0024] Specifically, an outboard length of the flange 2 is subjected to a limiting value of a width-thickness ratio of a plate as S3, and considering a restraining action of a concrete floor to the flange 2 of the H-shaped steel 1, the limiting value of the width-thickness ratio of the upper flange 21 is thinned to S4, thereby forming the

H-shaped steel 1 with unequal upper and lower flanges. The H-shaped steel 1 is connected to the concrete floor through studs, the concrete floor has a certain restraining action on local instability of the plate of the flange 2, and the upper flange 21 is subjected to the regulation of a width-thickness ratio through a distance between the studs and an edge distance from the studs to the upper flange 21, so as to implement restraint on the upper flange 21 of the H-shaped steel 1, relax the restraint of the width-thickness ratio on the width of the flange 2, and implement the full development of the strength of the upper flange 21.

[0025] Specifically, for a high-rise steel structure, further including a frame column with a high-grade steel (Q420 and Q460), a node of the H-shaped steel 1 and the frame column is provided with a connecting plate, a steel grade of the connecting plate is set as the steel that is same with the steel grade of the flange 2, the connection between two steels (Q355 and Q420 or Q355 and Q460) is converted, the conversion of the connection among three steels into the connection between two steels is implemented, and the connection design and construction may be completed by using the existing technology.

[0026] Specifically, the flange 2 adopts the high grade steel, when the web 3 adopts (Q235) and a maximum stress of the web 3 is less than 235 MPa, a computational formula is regarded as a canonical formula; when the maximum stress of the web 3 is greater than or equal to the steel grade 235 MPa of the web 3, the web 3 yields and enters a plastic zone, the stress entering the plastic part will not be increased, and the flange 2 is still in an elastic stage, so the stress can be further improved; and when the connection technology of the H-shaped steel 1 and the frame column is different from the steel grade of the web and the flange, the calculation method is as follows: 5 [0027] upon calculation of a triangle similarity principle, the computational formula for the plastic zone is X=(c-fy)h/2c:

[0028] The bending bearing capacity of the H-shaped steel 1 cuts out the plastic zone.

[0029] The computational formula for the bending bearing capacity: M = vo*w-0.5%(o-fy)* X*(h-2tw-2X/3 )*tf;

[0030] v is a plastic development coefficient of a section, fy is a yield strength of the web 3, and the web 3 may adopt Q235 steel, and X in the computational formula for the plastic zone is brought into the computational formula for the bending bearing capacity, to obtain the bending bearing capacity M.

[0031] Embodiment 2:

[0032] Please refer to FIG. 1, the present disclosure provides a technical solution: a high-efficiency welded H-shaped steel 1 and an application technology thereof, including a H-shaped steel 1, and the H-shaped steel 1 includes a flange 2, which is set as a high-grade steel (Q355 or Q390) and includes an upper flange 21 and a lower flange 22, and the upper flange 21 and the lower flange 22 are arranged in parallel with unequal thickness; and a web 3, which is set as a low-grade steel (Q235), the web 3 is vertically arranged between the upper flange 21 and the lower flange 22, and two ends of the web 3 are in welding connection with the upper flange 21 and the lower flange 22, respectively. The steel (Q355 or Q390) with the high-strength grade is used as the flange 2, and the steel (Q235) with the low-strength grade is used as the web 3, and the flange 2 and the web 3 are combined and welded to the H-shaped steel 1; when the

H-shaped steel 1 has a high loading capacity on the flange 2 and low loading capacity on the web, and implementing that on the one hand, the H-shaped steel has a higher steel strength, and on the other hand, the strength of the high-strength steel may be fully developed.

[0033] Specifically, an outboard length of the flange 21 is subjected to a limiting value of a width-thickness ratio of a plate as S3, and considering a restraining action of a concrete floor to the flange 2 of the H-shaped steel 1, the limiting value of the width-thickness ratio of the upper flange 21 is thinned to S4, thereby forming the

H-shaped steel 1 with unequal upper and lower flanges 21. The H-shaped steel 1 is connected to the concrete floor through studs, the concrete floor has a certain restraining action on local instability of the plate of the flange 2, and the upper flange 21 is subjected to the regulation of a width-thickness ratio through a distance between the studs and an edge distance from the studs to the upper flange 21, so as to implement restraint on the upper flange 21 of the H-shaped steel 1, relax the restraint of the width-thickness ratio on the width of the flange 2, and implement the full development of the strength of the upper flange 21.

[0034] Specifically, for a high-rise steel structure, further including a frame column with a high-grade steel (Q420 and Q460), a node of the H-shaped steel 1 and the frame column is provided with a bracket, a steel grade of the bracket is set as the steel that is same with the steel grade of the flange 2, the connection between two steels (Q355 and

Q420 or Q355 and Q460) is converted, the conversion of the connection among three steels into the connection between two steels is implemented, and the connection design and construction may be completed by using the existing technology.

[0035] Specifically, the flange 2 adopts the high grade steel, when the web 3 adopts (Q235) and a maximum stress of the web 3 is less than 235 MPa, a computational formula is regarded as a canonical formula; when the maximum stress of the web 3 is greater than or equal to the steel grade 235 MPa of the web 3, the web 3 yields and enters a plastic zone, the stress entering the plastic part will not be increased, and the flange 2 is still in an elastic stage, so the stress can be further improved; and when the connection technology of the H-shaped steel 1 and the frame column is different from the steel grade of the web and the flange, the calculation method is as follows:

[0036] Upon calculation of a triangle similarity principle, a computational formula for the plastic zone is X=(6-fy)h/26:

[0037] The bending bearing capacity of the H-shaped steel 1 cuts out the plastic zone.

[0038] The computational formula for the bending bearing capacity: M = vo*w-0.5%(o-fy)* X*(h-2tw-2 X/3)*tf;

[0039] v is a plastic development coefficient of a section, fy is a yield strength of the web 3, and the web 3 may adopt Q235 steel, and X in the computational formula for the plastic zone is brought into the computational formula for the bending bearing capacity, to obtain the bending bearing capacity M.

[0040] In the description of the present disclosure, unless specific regulation and limitation otherwise, terms “install”, “join”, “connect” and “fix” should be generally understood, for example, may be a fixed connection, a detachable connection, or integrated, may be a mechanical connection or an electric connection, may be a direct connection or an indirect connection through an intermediation, and may an internal connection of two elements or an interactive relationship of two elements. Those of ordinary skill in the art may understand the specific meaning of the terms in the present disclosure according to specific conditions.

[0041] All standard parts used herein may be purchased from the market, irregular parts may be customized according to the record of the specification and the drawings, specific connection modes of various parts all adopt the mature bolt, rivet, welding and other conventional means in the prior art, machines, parts and equipment all adopt the conventional models in the prior art, and in addition, the circuit connection adopts the conventional connection mode in the prior art, therefore details are not made herein.

[0042] Although the embodiments of the present disclosure have been presented and described, those of ordinary skill in the art may understand that various changes, modifications, replacements and deformations can be made to these embodiments without deviating from the principle of spirit of the present disclosure, and the scope of the present disclosure is defined by the appended claims and their equivalents.

Claims

ConclusiesConclusions

1. Zeer efficiënt gelast H-vormig staal, dat een H-vormig staal (1) omvat, waarbij het H-vormige staal (1) het volgende omvat: een flens (2), die als hoogwaardig staal ingesteld is en een bovenste flens (21) en een onderste flens (22) omvat, en waarbij de bovenste flens (21) en de onderste flens (22) parallel aangebracht zijn met ongelijke dikte; en een verbindingsstuk (3), dat als laagwaardig staal ingesteld is, waarbij het verbindingsstuk (3) verticaal tussen de bovenste flens (21) en de onderste flens (22) aangebracht is, en de twee uiteindes van het verbindingsstuk (3) met respectievelijk de bovenste flens (21) en de onderste flens (22) in lasverbinding zijn.1. High-efficiency welded H-shaped steel, which includes an H-shaped steel (1), wherein the H-shaped steel (1) includes: a flange (2) set as high-strength steel and an upper flange (21) and a lower flange (22), and wherein the upper flange (21) and the lower flange (22) are arranged parallel with unequal thickness; and a connecting piece (3) set as low-grade steel, the connecting piece (3) being arranged vertically between the upper flange (21) and the lower flange (22), and the two ends of the connecting piece (3) with respectively the upper flange (21) and the lower flange (22) are in welded connection.

2. Zeer efficiënt gelast H-vormig staal volgens conclusie 1, waarbij een buitenboordlengte van de flens (2) onderworpen is een aan grenswaarde van een breedte- dikteverhouding van een plaat als S3, en de grenswaarde van de breedte-dikteverhouding van de bovenste flens (21) tot S4 verdund wordt.A high-efficiency welded H-shaped steel according to claim 1, wherein an outboard length of the flange (2) is subject to a limit value of a width-to-thickness ratio of a plate such as S3, and the limit value of the width-to-thickness ratio of the upper flange (21) until S4 is diluted.

3. Toepassing van het zeer efficiënt gelaste H-vormige staal volgens conclusie 1, waarbij het H-vormige staal (1) middels studs aan een betonnen vloer verbonden is.3. Application of the highly efficiently welded H-shaped steel according to claim 1, wherein the H-shaped steel (1) is connected to a concrete floor by means of studs.

4. Toepassing volgens conclusie 3, waarbij de breedte-dikteverhouding van de bovenste flens (21) door een afstand tussen de studs en een randafstand van de studs tot de bovenste flens (21) gereguleerd wordt.Use according to claim 3, wherein the width-to-thickness ratio of the upper flange (21) is regulated by a distance between the studs and an edge distance from the studs to the upper flange (21).

5. Zeer efficiënt gelast H-vormig staal volgens conclusie 1, die verder een framekolom van hoogwaardig staal voor een hoogbouw staalconstructie omvat, en een knoop tussen het H-vormige staal (1) en de framekolom is van een verbindingsplaat of een beugel voorzien.The high-efficiency welded H-shaped steel according to claim 1, which further comprises a frame column of high-quality steel for a high-rise steel structure, and a node between the H-shaped steel (1) and the frame column is provided with a connecting plate or a bracket.

6. Zeer efficiënt gelast H-vormig staal volgens conclusie 5, waarbij een staalkwaliteit van de verbindingsplaat hetzelfde als die van de flens (2) is.High-efficiency welded H-shaped steel according to claim 5, wherein a steel quality of the connecting plate is the same as that of the flange (2).

7. Zeer efficiënt gelast H-vormig staal volgens conclusie 5, waarbij een staalkwaliteit van de beugel hetzelfde als die van de flens (2) is.High-efficiency welded H-shaped steel according to claim 5, wherein a steel quality of the bracket is the same as that of the flange (2).

8. Zeer efficiënt gelast H-vormig staal volgens conclusie 1, waarbij, wanneer een maximale druk van het verbindingsstuk (3) groter dan of gelijk aan de staalkwaliteit van het verbindingsstuk (3) is, het verbindingsstuk (3) meegeeft en een in een plastische zone terecht komt, en een buigend draagvermogen van het H-vormige staal (1) de plastische zone uitschakelt.8. High-efficiency welded H-shaped steel according to claim 1, wherein, when a maximum pressure of the connecting piece (3) is greater than or equal to the steel quality of the connecting piece (3), the connecting piece (3) yields and in a plastic zone, and a bending load capacity of the H-shaped steel (1) eliminates the plastic zone.

9. Zeer efficiënt gelast H-vormig staal volgens conclusie 7, waarbij, bij berekening van een driehoeksvergelijkingsprincipe, een rekenformule voor de plastische zone X-=(6-fy)h/26 1s; de rekenformule voor het buigend draagvermogen is: M = yo*w-0,5%(c-fy)* X* (h-2tw-2X/3 )*tf, y een plastische ontwikkelingscoëfficiënt van een sectie is, fy een opbrengsterkte van het verbindingsstuk (3) is, en het verbindingsstuk (3) Q235 staal gebruikt, en X in de rekenformule voor de plastische zone in de rekenformule voor het buigend draagvermogen gebracht is, om het buigend draagvermogen M te verkrijgen.9. Highly efficient welded H-shaped steel according to claim 7, wherein, when calculating a triangular equation principle, a calculation formula for the plastic zone X-=(6-fy)h/26 1s; the calculation formula for the bending load capacity is: M = yo*w-0.5%(c-fy)* of the connecting piece (3), and the connecting piece (3) uses Q235 steel, and X in the calculation formula for the plastic zone is entered into the calculation formula for the bending load capacity, to obtain the bending load capacity M.